selftests/drivers/net: Add an xdp test to xdp.py

In "bpf: Disallow freplace on XDP with mismatched xdp_has_frags values" [1],
this XDP test is suggested to add to xdp.py.

1. Verify the failure of updating frag-capable prog with non-frag-capable
   prog, when the frag-capable prog attaches to mtu=9k driver.

The test has been verified against Mellanox CX6 and Intel 82599ES NICs.

With dropping other tests, here is the test log.

 # ethtool -i eth0
 driver: mlx5_core
 version: 6.19.0-061900-generic

 # NETIF=eth0 python3 xdp.py
 TAP version 13
 1..1
 ok 1 xdp.test_xdp_native_update_mb_to_sb
 # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0

 # ethtool -i eth0
 driver: ixgbe
 version: 6.19.0-061900-generic

 # NETIF=eth0 python3 xdp.py
 TAP version 13
 1..1
 # CMD: ip  link set dev eth0 xdpdrv obj /path/to/tools/testing/selftests/net/lib/xdp_dummy.bpf.o sec xdp.frags
 #   EXIT: 2
 #   STDERR: RTNETLINK answers: Invalid argument
 ok 1 xdp.test_xdp_native_update_mb_to_sb # SKIP device does not support multi-buffer XDP
 # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:1 error:0

Signed-off-by: Leon Hwang <leon.huangfu@shopee.com>
Link: https://patch.msgid.link/20260406072655.368173-1-leon.huangfu@shopee.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

0 files changed, 0 insertions, 0 deletions